<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    var movie={
        movieName:"长津湖",
        duration:176,
        price:50
    }

    //for in 会遍历取出对象的属性
    //可以 对象[k]
    for(var k in movie){
        console.log(k);
    //    console.log(movie.k);  //undefined
        console.log(movie[k]);
    }
</script>
</html>